/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.executor.operator;

import com.alibaba.polardbx.optimizer.context.ExecutionContext;
import com.alibaba.polardbx.optimizer.core.CursorMeta;

public class MergeSortTableScanClient extends TableScanClient {

    public MergeSortTableScanClient(ExecutionContext context, CursorMeta meta,
                                    boolean useTransaction, int prefetchNum) {
        super(context, meta, useTransaction, prefetchNum);
    }

    @Override
    public synchronized void addSplitResultSet(SplitResultSet splitResultSet) {
        readyResultSet.add(splitResultSet);
        executePrefetchThread(false);
        if (readyResultSet.size() == getSplitNum()) {
            notifyBlockedCallers();
        }
    }

    @Override
    public int connectionCount() {
        //对于merge-sort，使用滑动窗口
        return pushdownSplitIndex.get() - readyResultSet.size();
    }
}
